It does look like a possible copy. That dull silver color looks iffy. I would check with the ANA to be sure.
The silver content does look a little bland, but i have also heard of mint marks being glued on. They take a regular mint mark and gently scrap it...
I have a 2009 proof Jefferson nickle that i flund in one of 4 proof sets i bought in 2009 from the mint. This one is clash died in several places...
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